Don’t worry if you missed the first two parts of Emmy-winning documentarians Joe Berlinger and Bruce Sinofsky’s epic chronicle of the “West Memphis Three,” Arkansas teens convicted of the 1993 murders of three eight-year-old boys. Paradise Lost 3: Purgatory quickly catches you up on this lightning-rod case, initially tried without a shred of physical evidence and amidst hysterical claims of satanic cultism. We then flash forward to the present, where the accused await their final appeal and staggering new revelations further point to a gross miscarriage of justice. A stranger-than-fiction American tragedy, capped by a remarkable reversal of fortune, Paradise Lost 3 is also a profound meditation on the passage of time, lives interrupted, and salvation too long in coming. An HBO Documentary Films release.